C# 加密解密处理

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原创最新推荐文章于 2026-06-20 11:44:39 发布 1.1k 阅读 AI 写同款· GEO 优化 ›

C#中字母与ASCⅡ码的转换使用Encoding类的GetEncoding静态方法得到Encoding对象，然后调用Encoding对象的GetBytes方法，该方法接收一个字符串或字符数组作为参数，最后GetBytes方法会返回字节数组对象，可以根据字节数组的第0个索引来得到字符串中第一个字母的ASCⅡ码。现在已经了解到Char是值类型，如果将Char显式转换为数值类型，可以方便地得到ASCⅡ码值。Encoding对象的GetBytes方法接收一个字符串或字符数组作为参数，最后返回字节数组，可以根据字节数组得到字母的ASCⅡ码。阅读详情

话不多说，直接来代码

                  /// <summary> 
		/// 加密数据 
		/// </summary> 
		/// <param name="Text"></param> 
		/// <param name="sKey"></param> 
		/// <returns></returns> 
		public static string Encrypt(string Text,string sKey) 
		{
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray;
                inputByteArray = Encoding.Default.GetBytes(Text);
                des.Key = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                des.IV = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                StringBuilder ret = new StringBuilder();
                foreach (byte b in ms.ToArray())
                {
                    ret.AppendFormat("{0:X2}", b);
                }
                return ret.ToString();
            } 
		}

                  /// <summary> 
		/// 解密数据 
		/// </summary> 
		/// <param name="Text"></param> 
		/// <param name="sKey"></param> 
		/// <returns></returns> 
		public static string Decrypt(string Text,string sKey) 
		{
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                int len;
                len = Text.Length / 2;
                if (len < 8)
                    return Text;
                byte[] inputByteArray = new byte[len];
                int x, i;
                for (x = 0; x < len; x++)
                {
                    i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                    inputByteArray[x] = (byte)i;
                }
                des.Key = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                des.IV = ASCIIEncoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Encoding.Default.GetString(ms.ToArray());
            } 
		}

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